Effect of Hemicellulose on the Wet Tensile Strength of Kozo Paper

Author:

Han Zhiyou1ORCID,Kida Keiko2,Katsumata Kyoko Saito23,Handa Masaki4,Inaba Masamitsu2ORCID

Affiliation:

1. Conservation Standards Research Institute, The Palace Museum, Beijing 100009, China

2. Conservation Science Laboratory, Graduate School of Conservation, Tokyo University of the Arts, Tokyo 110-8714, Japan

3. Graduate School of Agricultural and Life Sciences, Faculty of Agriculture, University of Tokyo, Tokyo 113-8654, Japan

4. Handa Kyuseido Co., Ltd., Tokyo 151-0064, Japan

Abstract

Kozo paper, usu-mino-gami, is frequently used as the first back lining paper of hanging scrolls in order to support the main paper with a painting or a work of calligraphy on it. To dye it an appropriate color, paper is often treated with an alkali mordant solution. However, current kozo paper products have received such comments from conservators that wet tensile strength is weak and hard to handle. Therefore, improving the wet tensile strength of kozo paper is required. In previous papers, the effect of the sheet forming method, cooking condition, and parenchyma cell content between fibers on the wet tensile strength of kozo paper has been investigated. In this paper, the effect of glucuronoxylan, the main component of hardwood hemicellulose on the wet tensile strength of kozo paper was investigated. The wet tensile strength of kozo paper, when made in different cooking conditions, was evaluated using the Finch device. Glucuronoxylan content in fiber was analyzed using GC-FID. According to the results, it has been proved that glucuronoxylan content (with a xylan to glucan molar ratio of 4.43% to 5.16%) itself contributes to the wet tensile strength of the kozo sheet. Therefore, to increase the wet tensile strength of kozo paper, it is recommended to cook under milder conditions, thus retaining a higher amount of glucuronoxylan in the pulp.

Funder

JSPS Grant for Aid in Scientific Research

“Development of Methods for Producing Durable Kozo Paper”

Manabu Yoshida Memorial Scientific Research Grant for Cultural Properties

“Study to Improve Wet Strength of Kozo Paper Used for Conservation of Cultural Properties”

Conservation and Cultural Study Project-Subject Research Project-Belt

Publisher

MDPI AG

Subject

Chemistry (miscellaneous),Analytical Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Molecular Medicine,Drug Discovery,Pharmaceutical Science

Reference19 articles.

1. Effect of Sheet Forming Method on Wet Tensile Strength of Usu-mino-gami (Japanese Kozo Paper);Inaba;Jpn. Tappi J.,2019

2. Effect of Cooking Method on Wet Tensile Strength of Kozo Paper;Han;Jpn. Tappi J.,2020

3. Ishii, T. (2010). Mokushitsu no Kagaku (Wood Chemistry) Nihon Mokuzai Gakkai (The Japan Wood Research Society) Ed., Bun-eido Shuppan.

4. Watanabe, R. (2010). Mokushitsu no Kagaku (Wood Chemistry) Nihon Mokuzai Gakkai (The Japan Wood Research Society) Ed., Bun-eido Shuppan.

5. Influence of Birch Xylan Adsorption during Kraft Cooking on Softwood Pulp Strength;Danielsson;Nord. Pulp Pap. Res. J.,2005

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